GestureDetectorCompat

Kotlin |Java

class GestureDetectorCompat

kotlin.Any
↳	androidx.core.view.GestureDetectorCompat

Detects various gestures and events using the supplied MotionEvents. The OnGestureListener callback will notify users when a particular motion event has occurred. This class should only be used with MotionEvents reported via touch (don't use for trackball events).

This compatibility implementation of the framework's GestureDetector guarantees the newer focal point scrolling behavior from Jellybean MR1 on all platform versions.

To use this class:

• Create an instance of the GestureDetectorCompat for your View
• In the View#onTouchEvent(MotionEvent) method ensure you call onTouchEvent(MotionEvent). The methods defined in your callback will be executed when the events occur.

Summary

Public constructors
<init>(context: Context!, listener: OnGestureListener!) Creates a GestureDetectorCompat with the supplied listener.
<init>(context: Context!, listener: OnGestureListener!, handler: Handler!) Creates a GestureDetectorCompat with the supplied listener.

Public methods
Boolean	isLongpressEnabled()
Boolean	onTouchEvent(event: MotionEvent!) Analyzes the given motion event and if applicable triggers the appropriate callbacks on the OnGestureListener supplied.
Unit	setIsLongpressEnabled(enabled: Boolean) Set whether longpress is enabled, if this is enabled when a user presses and holds down you get a longpress event and nothing further.
Unit	setOnDoubleTapListener(listener: OnDoubleTapListener!) Sets the listener which will be called for double-tap and related gestures.

Public constructors

<init>

GestureDetectorCompat(
    context: Context!, 
    listener: OnGestureListener!)

Creates a GestureDetectorCompat with the supplied listener. As usual, you may only use this constructor from a UI thread.

Parameters
context	Context!: the application's context
listener	OnGestureListener!: the listener invoked for all the callbacks, this must not be null.

See Also

• android.os.Handler#Handler()

<init>

GestureDetectorCompat(
    context: Context!, 
    listener: OnGestureListener!, 
    handler: Handler!)

Creates a GestureDetectorCompat with the supplied listener. As usual, you may only use this constructor from a UI thread.

Parameters
context	Context!: the application's context
listener	OnGestureListener!: the listener invoked for all the callbacks, this must not be null.
handler	Handler!: the handler that will be used for posting deferred messages

See Also

• android.os.Handler#Handler()

Public methods

isLongpressEnabled

fun isLongpressEnabled(): Boolean

Return
Boolean: true if longpress is enabled, else false.

onTouchEvent

fun onTouchEvent(event: MotionEvent!): Boolean

Analyzes the given motion event and if applicable triggers the appropriate callbacks on the OnGestureListener supplied.

Parameters
event	MotionEvent!: The current motion event.

Return
Boolean: true if the OnGestureListener consumed the event, else false.

setIsLongpressEnabled

fun setIsLongpressEnabled(enabled: Boolean): Unit

Set whether longpress is enabled, if this is enabled when a user presses and holds down you get a longpress event and nothing further. If it's disabled the user can press and hold down and then later moved their finger and you will get scroll events. By default longpress is enabled.

Parameters
enabled	Boolean: whether longpress should be enabled.

setOnDoubleTapListener

fun setOnDoubleTapListener(listener: OnDoubleTapListener!): Unit

Sets the listener which will be called for double-tap and related gestures.

Parameters
listener	OnDoubleTapListener!: the listener invoked for all the callbacks, or null to stop listening for double-tap gestures.